It was on the first day of Beltaine, that is called now May Day, the Tuatha de Danaan came, and it was to the north-west of Connacht they landed. But the Firbolgs, the Men of the Bag, that were in Ireland before them, and that had come from the South, saw nothing but a mist, and it lying on the hills.

Gods and Fighting Men: The Story of the Tuatha de Danaan and of the Fianna of Ireland (ed. 1905)